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Note 12 - Self-Insurance (Details Textual) $ in Thousands | Dec. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($)
--- | --- | ---
Restricted Cash and Cash Equivalents, Total | $ 3,417 | $ 3,283
Future Workers' Compensation Claim Payments [Member] |  |
Restricted Cash and Cash Equivalents, Total | $ 3,400 | 3,300
Mining Properties and Mineral Rights [Member] |  |
Number of Mining Units | 7 |
Area of Real Estate Property | item | 10 |
Operating Lease, Liability, Total | $ 280,000 | $ 260,000

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